Implement support for taef1 latent previews (#4409)

* add taef1 handling to several places

* remove guess_latent_channels and add latent_channels info directly to flux model

* remove TODO

* fix numbers

comfy/latent_formats.py

@@ -141,6 +141,7 @@ class StableAudio1(LatentFormat):
     latent_channels = 64
 
 class Flux(SD3):
+    latent_channels = 16
     def __init__(self):
         self.scale_factor = 0.3611
         self.shift_factor = 0.1159
@@ -162,6 +163,7 @@ class Flux(SD3):
             [-0.0005, -0.0530, -0.0020],
             [-0.1273, -0.0932, -0.0680]
         ]
+        self.taesd_decoder_name = "taef1_decoder"
 
     def process_in(self, latent):
         return (latent - self.shift_factor) * self.scale_factor

nodes.py

@@ -665,6 +665,8 @@ class VAELoader:
         sd1_taesd_dec = False
         sd3_taesd_enc = False
         sd3_taesd_dec = False
+        f1_taesd_enc = False
+        f1_taesd_dec = False
 
         for v in approx_vaes:
             if v.startswith("taesd_decoder."):
@@ -679,12 +681,18 @@ class VAELoader:
                 sd3_taesd_dec = True
             elif v.startswith("taesd3_encoder."):
                 sd3_taesd_enc = True
+            elif v.startswith("taef1_encoder."):
+                f1_taesd_dec = True
+            elif v.startswith("taef1_decoder."):
+                f1_taesd_enc = True
         if sd1_taesd_dec and sd1_taesd_enc:
             vaes.append("taesd")
         if sdxl_taesd_dec and sdxl_taesd_enc:
             vaes.append("taesdxl")
         if sd3_taesd_dec and sd3_taesd_enc:
             vaes.append("taesd3")
+        if f1_taesd_dec and f1_taesd_enc:
+            vaes.append("taef1")
         return vaes
 
     @staticmethod
@@ -712,6 +720,9 @@ class VAELoader:
         elif name == "taesd3":
             sd["vae_scale"] = torch.tensor(1.5305)
             sd["vae_shift"] = torch.tensor(0.0609)
+        elif name == "taef1":
+            sd["vae_scale"] = torch.tensor(0.3611)
+            sd["vae_shift"] = torch.tensor(0.1159)
         return sd
 
     @classmethod
@@ -724,7 +735,7 @@ class VAELoader:
 
     #TODO: scale factor?
     def load_vae(self, vae_name):
-        if vae_name in ["taesd", "taesdxl", "taesd3"]:
+        if vae_name in ["taesd", "taesdxl", "taesd3", "taef1"]:
             sd = self.load_taesd(vae_name)
         else:
             vae_path = folder_paths.get_full_path("vae", vae_name)